package com.canto.access.component;

import com.canto.access.services.DynamicSecurityService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.PathMatcher;

import javax.annotation.PostConstruct;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * 动态权限数据源，用于获取动态权限规则
 *
 * @author jsryin
 * @version 2021-07-02
 */
public class DynamicSecurityMetadataSource implements FilterInvocationSecurityMetadataSource {

    private static Map<String, ConfigAttribute> configAttributeMap = null;

    @Autowired
    private DynamicSecurityService dynamicSecurityService;

    @PostConstruct
    public void loadDataSource() {
        configAttributeMap = dynamicSecurityService.loadDataSource();
    }

    public void clearDataSource() {
        configAttributeMap.clear();
        configAttributeMap = null;
    }

    @Override
    public Collection<ConfigAttribute> getAttributes(Object o) throws IllegalArgumentException {
        if (configAttributeMap == null) {
            this.loadDataSource();
        }

        List<ConfigAttribute> configAttributes = new ArrayList<>();
        //获取当前访问的路径
        String requestUrl = ((FilterInvocation) o).getRequestUrl();
        PathMatcher pathMatcher = new AntPathMatcher();
        //获取访问该路径所需资源
        for (Map.Entry<String, ConfigAttribute> entry : configAttributeMap.entrySet()) {
            if (pathMatcher.match(entry.getKey(), requestUrl)) {
                configAttributes.add(entry.getValue());
            }
        }

        return configAttributes;
    }

    @Override
    public Collection<ConfigAttribute> getAllConfigAttributes() {
        return null;
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return true;
    }

}
